Method for making magnesium/magnesium alloy-and-resin composite and magnesium/magnesium alloy-and-resin composite thereof

Abstract

A magnesium/magnesium alloy-and-resin composite includes a magnesium/magnesium alloy substrate, and at least a resin composition coupled to a surface of the substrate. The surface of the substrate is formed with a plurality of pores having a diameter having a range of about 70 nm-400 nm and a depth having a range of about 60 nm-800 nm. The resin composition contains crystalline thermoplastic synthetic resins. A method for making the magnesium/magnesium alloy-and-resin composite is also described.

What is claimed is: 
     
         1 . A magnesium/magnesium alloy-and-resin composite, comprising:
 a magnesium/magnesium alloy substrate, a surface of the substrate being formed with a plurality of pores having a diameter having a range of about 70 nm-400 nm and a depth having a range of about 60 nm-800 nm; and   at least a resin composition coupled to the surface of the substrate, the resin composition containing crystalline thermoplastic synthetic resins.   
     
     
         2 . The composite as claimed in  claim 1 , wherein the surface of the substrate is a roughened surface having a coral reef like structure. 
     
     
         3 . The composite as claimed in  claim 1 , wherein the resin composition fills the pores of the substrate. 
     
     
         4 . The composite as claimed in  claim 1 , wherein the resin composition is a molded crystalline thermoplastic synthetic resin composition. 
     
     
         5 . The composite as claimed in  claim 1 , wherein the crystalline thermoplastic synthetic resin is polyphenylene sulfide containing fiberglass. 
     
     
         6 . A method for making a magnesium/magnesium alloy-and-resin composite, comprising:
 providing a magnesium/magnesium alloy substrate;   chemically etching the substrate using sodium carbonate water solution and citrate hydrate water solution respectively to rough a surface of the substrate and form a plurality of recesses in the surface;   electrochemically treating the substrate using a water solution containing sodium silicate, potassium hydroxide, and citric acid to form a plurality of pores in the surface, the pores having a diameter having a range of about 70 nm-400 nm and a depth having a range of about 60 nm-800 nm; and   inserting the substrate in a mold and molding crystalline thermoplastic synthetic resin on the surface of the substrate to form the composite.   
     
     
         7 . The method as claimed in  claim 6 , wherein electrochemically treating the substrate is carried out in the water solution for about 9 minutes-18 minutes with the substrate being an anode, a stainless steel board being a cathode, the mass concentration of the sodium silicate is about 20 g/L-50 g/L, the mass concentration of the potassium hydroxide is about 10 g/L-40 g/L, and the mass concentration of the citric acid is about 5 g/L-20 g/L, electric current density through the water solution is about 0.2 mA/cm 2 -0.5 mA/cm 2 . 
     
     
         8 . The method as claimed in  claim 6 , wherein the sodium carbonate water solution has a mass concentration of about 1%-5%. 
     
     
         9 . The method as claimed in  claim 6 , wherein the citrate hydrate water solution has a mass concentration of about 0.1%-0.5%. 
     
     
         10 . The method as claimed in  claim 6 , wherein the crystalline thermoplastic synthetic resin is polyphenylene sulfide containing fiberglass. 
     
     
         11 . The method as claimed in  claim 6 , wherein the surface of the substrate is roughened and forms a coral reef like structure after the electrochemical treating process. 
     
     
         12 . The method as claimed in  claim 6 , wherein the crystalline thermoplastic synthetic resin fills the pores of the substrate. 
     
     
         13 . A magnesium/magnesium alloy-and-resin composite, comprising:
 a magnesium/magnesium alloy substrate, a surface of the substrate being formed with a plurality of pores having a diameter having a range of about 70 nm-400 nm and a depth having a range of about 60 nm-800 nm; and   at least a molded resin composition coupled to the surface of the substrate, the resin composition containing crystalline thermoplastic synthetic resins.